They're looking a bit rough. The first one is showing the neon green spots that are often a sign of systemic bacterial infection, and the other two have significant noserub. I strongly suggest reading up on quarantine, getting them into a more suitable (drier) environment, and getting in touch with a vet to acquire baytril and silver sulfadiazene. I use Dr. David Frye, he can be contacted at dr.frye.dvm@sbcglobal.net. Unfortunately "bargain" animals usually aren't bargains at all.